Al-Irsyad Mosque in Indonesia has a unique cubical form with stacked concrete blocks which create a tectonic effect and a graphic element in Islamic calligraphy. By night, the calligraphy on the façade is illuminated from the interior light in the mosque. The structural columns are arranged in such a way that the façade appears as if it was not supported by any frame.The blocks' systems create a natural ventilation without the usage of air-conditioning. Ninety-nine light boxes, symbolising 99 names of Allah, are shadowed naturally on the lighting box, without the use of artificial light.

Source: Aga Khan Trust for Culture